284 Plants and their Ways in South Africa 



by perianth leaves. Fruit a nut surrounded by an involucre, 

 the cup of the acorn and the burr ,of chestnuts. 



Pollination in the Oak occurs in September. At this time there are 

 no ovules in the three-chambered ovary to be fertilized. Soon, however, 

 two anatropous ovules appear in each chamber, only one of which is 

 destined to become a seed ; and after fertilization which occurs early in 



Fig. 257. — Protea cynaroides, L., Wiih Staavia glutinosa , Th. (Photograph 

 by E. J. Steer, Esq.) 



November the other five disappear, the one seed filling the entire ovary 

 which becomes the acorn. 



